A crew works with freshly poured concrete on a driveway in Indianapolis. Driveway extension ideas for homeowners looking to extend or expand a concrete or asphalt driveway. You purchased a new RV or maybe your teenager started to drive. If your existing driveway doesn't provide enough room for any number of reasons, you may need to widen or extend your driveway to better suit your needs.
Vitamins are conventionally divided into the fat-soluble group A, D, E and K, and the water-soluble group, vitamin C (ascorbic acid) and the B vitamins-B 1 (thiamine), B 2 (riboflavine, riboflavin), nicotinic acid, B6 (pyridoxine), pantothenic acid, biotin, folic acid and B12.
Vitamins are organic compounds found in very small amounts in food and required for normal functioningâindeed, for survival. Humans are able to synthesize certain vitamins to some extent. For example, vitamin D is produced when the skin is exposed to sunlight; niacin can be synthesized from the amino acid tryptophan; and vitamin K and biotin are synthesized by bacteria living in the gut.